Bug #44994 [Com]: exec() produces zombie processes on Windows, hangs Apache

From: Date: Wed, 06 Jun 2012 01:31:36 +0000
Subject: Bug #44994 [Com]: exec() produces zombie processes on Windows, hangs Apache
References: 1  Groups: php.bugs 
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Edit report at https://bugs.php.net/bug.php?id=44994&edit=1

 ID:                 44994
 Comment by:         mark at clevertech dot biz
 Reported by:        dbarrett at vistaprint dot com
 Summary:            exec() produces zombie processes on Windows, hangs
                     Apache
 Status:             Closed
 Type:               Bug
 Package:            Program Execution
 Operating System:   win32 only - 2003 Server, 64-bit
 PHP Version:        5.2.6
 Assigned To:        pajoye
 Block user comment: N
 Private report:     N

 New Comment:

WinXP Home SP3
XAMPP with:
PHP 5.3.8 built Aug 23, 2011
Apache 2.2.21 built Sep 10, 2011

This problem occurs with proc_open(), exec(), and popen().

Once a child process hangs, PHP in new page requests continues to run fine 
unless I call proc_open(), exec(), popen(), or session_start().

The problem ceases to occur when I call session_write_close() before my call to 
proc_open(), exec(), or popen().

I'm on a team of 6 developers, and we are running this on Linux, Mac, and 
several versions of Windows, but we've only seen this problem on Windows XP.

This is happening on a complex application using a large framework. I intend to 
post a straightforward test script later.


Previous Comments:
------------------------------------------------------------------------
[2011-10-10 17:08:57] pajoye@php.net

@jameslively at insightbb dot com

What do you see exactly? Can you provide a small script and the cmd you use to 
test?

------------------------------------------------------------------------
[2011-10-10 15:31:25] jameslively at insightbb dot com

I am still seeing this issue on PHP 5.3.8.  I am running the site on Windows 2k3 sp3 and Apache 2.2.

------------------------------------------------------------------------
[2011-05-05 18:09:25] pajoye@php.net

Fixed in 5.3.x

------------------------------------------------------------------------
[2011-05-05 17:52:08] php at mmtbb dot com

Testing on PHP v5.3.1 (installed with XAMPP), I'm able to run 50 concurrent popen requests
without any fault. All processes terminate after completion.

I understand that the popen() and exec() were both experiencing this issue in the past, the 5.3.x
line seems to resolve the issue.

------------------------------------------------------------------------
[2010-01-06 17:35:17] patrick dot bueker at triangle-solutions dot de

I once had the problem too. I had the feeling that it has something to do with threadsafe or
non-threadsafe versions of PHP. I still have the problem on some installations, others work.

------------------------------------------------------------------------


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